Thread handling device



R. w. STANLEY THREAD HANDLING DEVI CE Feb. 4, 1947. 2,415,115

Filed March 27, 1945 2 Sheets-Sheet l 3 I III/III 11 MM M INVENTOR.

Feb. 4, 1947.

R. W; STANLEY THREAD HDIDLING DEVICE Filed larch 27, 1945 2 Sheets-Sheet 2 7 2: wuw

IN V EN TOR;

l'atented Feb. 4,

orricr.

THREAD HANDLINGDEVICE Richard W. Stanley, Drexel Hill, Pa., assignor to American Viscose Corporation, Wilmington, Del., a corporation of Delaware Application March 27, 1945, Serial No. 585,127

7 18 Claims. ((128-7131) This invention relates to thread handling devices and particularly to devices which serve the purpose of drawing the thread from one stage of operation and delivering it to another. The device of the invention is interchangeable from a simple thread-feeding rotor of the type frequently referred to as a godet to the form of a thread-advancing reel in which the strand is received at one end of the rotor and is advanced in a helical path to the other end of the rotor.

It is well known that the action of a-godet or simple rotoris merely to wrap the strand around it until the strand is led off to another device, and such wrapping occurs at one spot so that the turns tend to build up around one peripheral line of the rotor; unless a special lap-displacing guide is associated with the rotor so that each convolution of the strand is separated from the rotor and taken about the guide either through special hooks on the guide or with the guide canted with respect to the axis'of the rotor. On

rable from the standard'product, whereas if the with or without preliminary washing are collected in a preliminary wet state. After the operator is satisfied with the extrusion or other op-. eration, he puts the device of the present invention into operation as a thread-advancing reel, which discharges whatever has been wrapped upon the godet and advances following portions of the strand in a helical path thereabout, so that the operator can break of! the'preliminarily collected waste portion and advance the following portion of the strand through the subsequent stages of the machine. Such a procedure localizes the collection of waste where it is readily observable and sepathread were allowed to pass through all stages the other hand, a thread-advancing reel automatically carries the strand in helical turns from the receiving end of the reel to the op site end from which it generally is'discharged. If the reel is free of obstructions adjacent the discharge end, it may be undesirable for such discharge to occur, since the strands may fallinto a lower portion of a machine containing such reel where it may cause trouble with operation of the machine. -At times it is desirable,

therefore, to have a device which is selectively operable either as a simple thread-feeding or thread-collecting rotor or as a thread-advancing reel. For example, during the preliminary lacing up of a machine, it may be desirable to prevent the thread from going to a successive stage of the operating machine until the operator is certain that the extrusion or other preliminary stages are functioning well. During such time of preliminary observation, the operator may lead the thread to the interchangeable device of the present invention ,while operating it as a simple godet, so that the freshly extruded yarn -is collected right at this scene of observation until such time as he is satisfied that the operation is successful and the thread is ready to be passed through the entire sequence of operation in the machine, whether this be a continuous machine in which the entire series of liquid treatments for finishing the thread and the drying treatment are performed, or merely a machine of the non-continuous type in which the I coagulated thread, with or without stretching between pairs of devices of the present invention of 'the machine to the final collecting device,

such as a bobbin, twister or spinning pot, a subsequent separation is difiicult, and it may be necessary to throw out a safe margin of good quality material in order to besure that the preliminarily collected waste portion is entirely removed. A I

The device of the present invention, though described in connection with the artificial filament spinning'art, is applicable to handling threads and strands in general, particularly where situations' analogous to that just mentioned are involved. -It is to be understood, however, that the devices of the present invention can be used in other ways to accomplish other purposes. It is thought that the advantages and objects of the invention will be apparent from the drawings and the description thereof hereinafter.

In the drawings, which are illustrative of the invention,

Figure 1 is a cross section of one embodiment of the invention; v

Figure 2 is a section taken on the line II-II:

Figure 3 is a cross section of a modification;

Figure 4 is an elevation showing a mounting arrangement of the embodiment of Figure 3;

Figure 5 illustrates a modification of the embodiment of Figure 3; and

Figure ,6 is a modified arrangement of the embodiment of Figure 5.

As shown in Figures 1 and 2, the device of the invention is mounted in a frame 2, a main bearing 3 being provided for receiving a central shaft 4 which carries a gear 5 by which the device may be driven. A sleeve 6 is carried rotatably upon the shaft 4. At opposite ends the sleeve 5 carries the discs I and 8 respectively which are keyed or otherwise secured for rotation with the sleeve.

I an eccentric portion ll of the ing web it which carries fixed thereto one or more ofthe actuatable bar members I! which I respect to the axis of the main shaft 6.

labyrinthine seal it may be provided to prevent extend into the spaces between the bars l8 of the other set which constitute the concentric reel. The concentric reel comprises an inner supporting flange l9 and an outer supporting web 29 which may be suitably secured as by bolts 2| to the inner flange it, the bars I8 as shown being molded integrally with the web 20. Flexible sealing members 22 and 23 may be secured to the inside of the flanges it and 20 and to the opposite sides of the webs It to prevent the entrance of any liquids which may be applied to the strands On the periphery of the device from entering into the operating parts of the device. As shown, a suitable bearing, such as 25, is provided to support the web or flange 2t concentrically with A entry of any liquids into the bearing 25 and other operatingportions of the device. A bearing and clutch block 21 is keyed or otherwise fixedly secured to an outer portion of the sleeve 6 concentric withthe axis 'of the shaft 4.

An arm 28 pivotally mounted with respect to the frame 2 at 29 is shown with a clutch portion 3B in engagement with the clutch face of'the block 2?. The engaging face of the member 36 has a plurality of spaced depressions 3i, each consisting of a, portion of a spherical surface arranged in an annular ring therein. Clo-operating with the depressions 3! there are provided an annular rin of spaced recesses 32 receiving partially protruding balls 33 which are normally forced outwardly by spring 36 hearing against the bottom of the recesses. Screwed inset rings 35 have overhanging lips which prevent complete discharge of .the

. balls 33 from the recesses. As shown, the clutch member 30 has a flexible sealing ring 36 which bears against the adjacent inwardly sloping face 3'|jof the web 20. The web 20 is arranged to overhangthe member it and the outer surface of the clutch member 39 is sloped to a gradually decreasing diameter or neckat- 38, so that any bunch of material discharged over the end of the device will fall along the surfaceof the clutch member 30 to the neck 38, where it will be suspended out of the way of operations.

As shown in Figure 1, the device is operating as a reel, since the spring 39 secured to the arm 28 and the frame 2 forces the clutch face of the member 30 into engagement with the comple-- mentary clutch face of the block 21 carried by the eccentric sleeve 6. By thus holding the eccentric sleeve stationary, the eccentric set of barsv ll 1, are carried by their pistons l3 about the eccentric axis of the stationary sleeve 6, while the cams 9 and iii are held stationary by the sleeve 6, so

that actuation of thebars I1 is effected. This actuation is well known in the art and involves the movement of the bars I1 axially of the reel in the direction of advance 'of the thread during their intervals of protrusion from the main cage of bars I8. The cams 9 and iii are so related with respect to the eccentric as to accomplish advance of the thread during protrusion. of the actuated bar from the fixed bars l8 and to return the bars I! axially of the reel in the portion of the periphery thereof where they are in a receded position wth respect to the fixed bars l8.

If it is desired to operate the device as a simple rotor, it is merely necessary for the operator to swing the arm 28 about the pivot 29 into the dotted line position shown in'Figure 1 where the spring 39 will retain it by virtue of the fact that the line of the spring is offset from the pivot 29 in adirection opposite to that in which it forces the clutch 30 into engagement with the complementary clutch member of the device. In the dotted line position of the arxnZB, the eccentric sleeve 5 is free to rotate with the shaft 4 and does so, so that both sets of bars are rotated bodily as a unit about the axis of the shaft 4 and there i no actuation of the bars ll relative to theconcentric set of bars I8 since there is no relative motion between sleeve 6.

Devices of this type may be substituted for the other forms of thread-advancing devices, such as godets and associated lap-displacing guides, thread-advancing reels, and the like, in continuous or non-continuous artificial filament spinning machines, such as those which collect either a dryor wet-ground package of filaments in a spinning bucket, on a bobbin, or on a twister, such as a cap or ring twister. When such devices are substituted for those heretofore used, it is advantageous to lace up the machine with the arm 28 swung out of the way, and as each device is lace'd up, and at the time the operator decides that he desires to proceed to the next device and lace it up, he can swing the arm 28 downwardly or upwardly as the case may be, depending upon the positional relationship of the pivot 29 to the device, andthereby automatically convert it into a thread-advancing device. The arms 28 with its associated clutch member 3|! serve not only to give additional support to the outer end of the device and to'convert the device into a thread-advancing reel, but also as mentioned above, to catch any woundmass of thread collected on the device immediately prior to its being put into operation as a reel. It is to be understood that the device is being rotated by means of the gear 5 and shaft ti continuously even during the time required to change its operation from that of a simple rotor to that of a thread-advancing device.

Figures 3 and 4 show a modification in which the central shaft 4a has a bore through which a rod Ml extends and is freely slidable therein. The

"fixed reel members lBa carried by the web 20a are fixed for rotation with the shaft 4a and the flange Zia carries a sleeve 4| extending back to the frame 2a, a labyrinthine seal 42 being provided to" permit relative rotation while preventing entrance of foreign material into the operating parts of the device. The sleeve 6a having the eccentric block Ilia is provided with an outwardlyprojecting flange 42a carrying an inwardly extending annular rim or sleeve 43. The bearing 3a carries slidably mounted thereon a clutch member 44, a key 45 serving to prevent relative rotation between the bearing 3a and the member 44. The clutch member 44 is provided with radial recesses 45 receiving springs 46 which. press outwardly balls 41 co-operating with complementary depressions in the rim 43 of the eccentric sleeve 6a. The rim 43 has an annular groove 48 which has at the shaft d and'the eccentric portion Ila for carrying the supporting advancing reel.

spaced points thereabout laterally extending branch grooves 49 so that in the position of the block 44 as shown, the eccentric 6a is freely rotatable with respect to the frame 3a and the clutch 44 but when the member 44 is forced in a direction to the left as viewed in Figure 3, the balls 4'! engage the spaced grooves 49 on the inner periphery of the rim 43, thereby preventing relative rotation of the eccentric sleeve Sa with respect to the frame 3a and the clutch 44, unless such a high torque is applied to the. sleeve Ba tending to rotate it that the outward force of the springs 48 against the balls 41 is overcome. Two or more rods 50 are secured symmetrically to the clutch member 44 and extend slidably through the frame 2a. The rods 50 are provided with transverse pins 5| which extend into slots 52 of levers 53 mounted on pivots 54. The other ends of levers 53 carry similar slots 55 which co-operate with the transverse pin '56 or equivalent means on the rod 40. A spring 51 received in a recess of a frame part normally urges the rod 40 to the position shown in Figure 3.

The outer end of the rod 40 which protrudes from the axis of the device is adapted, to be pressed inwardly by an arm 28a pivotally mounted at 29a and under the control of spring 39a similar to the arrangement of Figures 1 and '2. In

, the position of Figure 4, the rod 40 is pressed inwardly, which causes sliding of the clutch 44 so Merely by swinging the arm. 28a out of the way,

in a fashion similar to that shown in Figure 1,

the rod and clutch member 44 take the position shown in Figure 3, in which the'eccentric sleeve 6a rotates with the shaft 4a and there is no actuation of the eccentric set of bars.

In the embodiment of Figure 5, an arrangement is shown similar to that in Figure 3, except that the arm 28 may be eliminated. In this embodiment, a rod 40a similar-to rod 40 of Figure 3 mounted slidably and rotatably within the shaft 441 and extending outwardly from the reel, as in Figure 3, beyond the driving gear, is provided with a knob at its outer end by which the operator can easily manipulate it. The other end of the rod is provided with a transverse pin 6| which fits within a cylindrical bore 62 of a stationary member 63. The rod 40a extends through a bore A 64 of the member 53, so that it is slidably and rotatably mounted therein; A transverse slot orkeyway 65is formed adjacent a portion of the bore 64 and extends from the bottom of the bore 62. In the position shown in Figure 5, the pin BI is prevented from entering the slot 65, whereas by simply turning the rod 40a at a 90 angle, the pin 6| will be aligned with the keyway 55 and the spring 65 will'urge the rod with the pin 6| to the left into the keyway. The rod 40a 'is provided with a collar ,6! rotatably mounted thereon (and restrained from axial motion by the fixed collars 61a and 61b) and carrying an outwardly projecting pin 68 for engaging slots 55a of the clutchengaging and disengaging linkage of the type shown in Figure 3. Thus by simply turning the knob 60 to a direction at right angles to that shown in Figure 5, the spring 66 is allowed to come into play to disengage the clutch 44a, so that the device will operate as a simple rotor or godet, whereas the operator can again merely push the rod 40a inward and turn the knob 60 in order to make the device resume operation as a thread- 6 Whereas the rod 40a extending through the shaft 4a,'it may be arranged so that itextends through an adjacent portion of the supporting framework for the device as shown in Figure 6 where it is designated 40b. An additional linkage 69 pivoted at 10 and carrying the pin H serves to connect with the links 53 and the rods 50 carried by the clutc member 44 as shown in Figure 3.

While specific forms of mechanism have been shown for effecting thread-advancing actuation of their supporting members, such as sets of bars, it is to be understood that the invention canbe applied to any form of reel comprising conventionally actuatable thread-supporting members, the invention herein being directed primarily to the arrangement and construction by which a thread-handling device can be converted selectively and alternately back and forth at will from I 20 a simple rotor to a thread-advancing reel," rebers. K

It is to be understood that changes and variaspirit and scope of the invention as. defined in the appended claims.

Iclaim:

eccentrically disposed sets of bars, the bars of each set having their thread-supporting surfaces lying in a substantially cylindrical surface, a rotatable shaft,. one set of bars being substantially concentrically secured to the shaft for rota tion therewith, an eccentric rotatably mounted on the shaft, the other set of. bars being rotatably mounted with respect to the eccentric, means secured to the eccentric for reciprocating the sec- 0nd set of bars during rotation of the bars rela- 2. A thread-handling device comprising two eccentrically disposed sets of bars, the bars of,

each set having their thread-supporting surfaces lying in a substantially cylindrical surface, a 50 rotatable shaft, one set of bars being substantially concentrically secured to the shaft for rotation therewith, an eccentric rotatably mounted on the shaft, the other set of bars beingrotatably mounted with respect to the eccentric, cam :means so secured to the eccentric for reciprocating the second set of bars during the rotation thereof relative to the eccentric, clutch means, and means for disengaging and engaging the clutch means with the eccentric for selectively impart- 0 ing and permitting relative rotation between the eccentric and the bars whereby reversible interchange of operation of the device is efiected between a thread-advancing condition and anonadvancing condition respectively.

8. A thread-handling device comprising two eccentrically disposed sets of thread-supporting bars, the bars of each set having their threadsupporting surfaces lying in a substantially cylindrical surface, a rotatable shaft, a supporting 70 frame-work for the shaft, one set of'bar being substantially concentrically secured to the shaft for rotation therewith, an eccentric rotatably mounted on the shaft, the other set of bars: being rotatably mounted with respect to the eccentric, cam means secured to the eccentric for reciprois shown in Figure. 5 as tions may be made without departing from the 1. A thread-handling device comprising two eccentrically disposed sets of thread-supporting bars, the bars of each set having their threadsupporting surfaces lying in a substantiall cylindrical surface, a rotatable shaft, a supporting framework for the shaft, one set of bars being substantially concentrically secured to the shaft for rotation therewith, an eccentric rotatabiy mountedon the shaft, the other set of bars being rotatably mounted with respect to the eccentric, cam means secured to the eccentric for reciprocating the second set of bars during rotation thereof relative to the eccentric, a clutch member connected to the framework, complementary clutch means connected to the eccentric, the clutch member being movable into and out of engagement with the clutch means for imparting and permitting relative rotation between the eccentric and the bars whereby reversible interchange of operation of the device is effected between a. thread-advancing condition and 'ia non-advancing condition respectively, said clutch member being, carried by an arm pivotally connected to the frame-, work at a point offset peripherally from the device and arranged to extend alongside the device to support the clutch member adjacent the outer end thereof during engagement thereof with the clutchmeans.

5. A thread-handling device comprising two eccentrically disposed sets of thread-supporting bars, the bars of each set, having their threadsupporting surfaces lying ina substantially cylindrlcal surface, a rotatable shaft, a' supporting framework for the shaft, one set of bars being substantially concentrically secured to the shaft for rotation therewith, an eccentric rotatably mounted on the shaft, the other set of bars being rotatably mounted with respect to the eccentric, cam means secured to the eccentric for reciprocating the second set of bars during rotation thereof relative to the eccentric, a, clutch member slidably mounted on a stationary element connected to the framework, complementary clutch means connected to the eccentric, the clutch member being movable into and out of engagement with the clutch means for imparting and permitting relative rotation be ween the.

eccentric and the bars whereby reversible interchange of operation of the device is effected betweenla thread-advancing condition and a nonadvancing condition respectively.

'- 6. A thread-handling device comprising two eccentrically disposed sets of thread-supporting bars, the bars of each. set having their threadsupporting surfaces lying in a substantially cylindrical surface, a rotatable shaft, 9, supporting framework for the shaft, one set of bars being substantially concentrically secured to the shaft for rotation therewith, an eccentricrotatably mounted on the shaft, the other set of bars being rotatablymounted with respect to the eccentric, cam means secured to the eccentric for reciprocating the second set of bars durin rotation thereof relative to the eccentric, a clutch ,member slidably mounted on a stationary element connected to the framework, complementary clutch means connected to the eccentric, the clutch member being movable, into and out of engagement with the clutch means for imparting and permitting relative rotation between the eccentric and the bars whereby reversible interchange of operation of the device is effected between a thread-advancing condition 'and a non-advancing condition respectively, a reciprocable element connected'to the clutch member for moving it into and out of engagement,spring means normally urging the element toward one extreme of its motion, and releasable means for holding the element toward the other limit of its motion in opposition to the spring means.

7. A thread-handling device comprising two eccentrically disposed sets of thread-supporting bars, the bars of each set having their threadsupporting surfaces lying in a substantially cylindrical surface, a hollow rotatable shaft, a supporting framework for the shaft, one set of bars being substantially concentrically secured to the shaft for rotation therewith, an eccentric rotatably mounted on the shaft, the other set of bars being rotatably mou'nted with respect to the eccentric, cam means secured to the eccentric for reciprocating the second set of bars during rotation thereof relative to the eccentric, aclutch member slidably mounted on a stationary element connected to the framework, complemen tary clutch means connected to the eccentric, the

clutch member being movable into and out of the device and connected to the clutch member for moving it into and out of engagement, spring means normally urging the rod toward one extreme of its motion, and releasable means for holding the rod toward the other limit of its motion in opposition to the spring means.

8. A thread-handling device comprising two e'ccentrically disposed sets of thread-supporting 0 bars, the bars of each set having their threadsupporting surfaces lying in-a substantially cylindrical surface, a hollow rotatable shaft supported adjacent one end only, a supporting framework for the shaft, one set of bars'being substantially concentrically secured to the shaft for rotation therewith, an eccentric rotatably mounted on the shaft, the other set of bars bein rotatably mounted with respect to the eccentric, cam means secured to the eccentric for reciproco eating the second set of bars during rotation thereof relative to the, eccentric, a clutch member slidably mounted on a stationary element connected to the framework, complementary clutch means connected to the eccentric, the clutch member being movable into and out of engagement with the clutch means for imparting and permitting relative rotation between the eccentric and the bars, whereby reversible interchange of operation of the device is effected betreme of its motion, and releasable means for holding the rod toward the other limit of its motion in opposition to the spring means.

9. A thread-handling device comprising two eccentrically disposedsets of thread-supporting bars, the bars of each set having their threadsupporting surfaces lying in a substantially cylindrical surface, a rotatable shaft, a supporting framework for the shaft, one set of bars being clutch means connected to the eccentric, the

clutch member being movable into and out of engagement with the clutch means for imparting and permitting relative rotation between the eccentric and the bars whereby reversible interchange of operation of the device is effected between a thread-advancing condition and a nonadvancing condition respectively, said clutch member being carried by an arm pivotally connected to the framework at a point offset peripherally from the device and arranged to extend alongside the device to support the clutch member adjacent the outer end thereof during engagement thereof with the clutch means, said arm having a portion tapering to a smaller diameter away from the device.

10. A thread-handling device comprising a plurality of thread-carrying members forming a generally cylindrical periphery, the members having their thread-carrying portions extending generally lengthwise of the device, means for rotating the device, means for actuating the 'memb'ers for advancing a thread carried in a plurality of thread-carrying members forming a generally cylindrical periphery, the members having their thread-carrying portions extending generally lengthwise of the device, means for rotating the device, means for actuating the.

members for advancing a thread carried 'in a generally helical path thereabout lengthwise of the device, means for selectively putting the actuating means into and out of operation respectively, a frame member disposed adjacent one end of the device for supporting it, and a control member for the selective means projecting generally axially through the device to the unsupported end thereof.

12. A thread-handling device comprising a plurality of thread-carrying members forming a generally cylindrical periphery, the members having their thread-carrying portions extending generally lengthwise of the device, means for rotating the device, means for actuating the members for advancing a thread carried'in a generally helical path thereabout lengthwise of the device, means for selectively puttirJg the actuating means into and out of operation respectively, a frame member disposed adjacent one end of the device for supporting it, and a control member for the selective means comprising an arm pivotally connected to the frame at a point offset peripherally from the device and swingable into and out of a position extending alongside the device with the outer end of the arm engaging the outer end of the device to effect reversible interchange of operation of the device between a thread-advancing condition and a non-advancing condition respectively.

13. A thread-handling device comprising two sets of bar members, each set having. their thread-supporting surfaces lying in a substantially cylindrical surface, means for rotating the device, means for actuating at least one set of bars relative to the other for effecting threadadvancing movement therealong, means for selectively putting the actuating means into and out of operation respectively, a frame member disposed adjacent one end of the device for supporting it, and a control member for the selective means comprising an arm carried by the frame member and movable to and from a position of engagement with the other end of the device to effect reversible interchange of operation of the device between a thread-advancing condition and a non-advancing condition respectively. I

14. A thread-handling device comprising two sets of bar members, each set having their thread-supporting surfaces lying in a substantially cylindrical surface, means for rotating the device, means for actuating at least one set of bars relative to the other for effecting threadadvancing movement therealong, means for selectively putting the actuating means into and out of operation respectively, a frame member disposed adjacent one end of the device for supporting it, and a control member for the 'selective means projecting generally axially through the device to the unsupported end thereof 15. A thread-handling device comprising two sets of bar members, each set having their thread-supporting surfaces lying in a substantially cylindrical surface, means for rotating the device, means for actuating at least one set of bars relative to the other for effecting threadadvancing movement therealong, means for selectively putting the actuating means into and out of operation respectively, a frame member disposed adjacent one end of the device for supporting it, and a control member for the selective means comprising an arm pivotally connected to the frame at a point offset peripherally from the device and swingable into and out of a position extending alongside the device with the outer end of the arm engaging the outer end of the device to effect reversible interchange of operation of the device between a thread-advancing condition and a non-advancing condition respectively. v

16. A thread-handling device comprising two eccentrically disposed sets of thread-supporting bars, the bars of each set having their thread-' of the device, means for selectively putting the actuating means into and out of operation respectively, ,a frame member disposed adjacent one end of the device for supporting it, and a control member for the selective means comprising an arm carried by the frame member and movable to and from a position of engagement with the other end of the device to effect reversible interchange of operation of the device between a thread-advancing condition and a non-advance ing condition respectively.

17. A thread-handling device comprising two eccentrioally disposed sets of thread-supporting supporting surfaces lying in a substantially cylindrical surface, the two sets being rotatable bodily centric to that of the first set, means for rotating the two sets simultaneously, means for actubars, the bars of each set having their threadating the bars of the second set relative to those of the first set to advance the thread lengthwise .of the device, means for selectively putting the actuating means into and out of operation respectively, a frame member disposed adjacent one end of the device for supporting it, and a control member for the selective means projecting generally axially through the device to the unsupported end thereof.

18. A thread-handling device comprising two eccentrically disposed sets of thread-supporting bars, the bars of each set having their threadpp rting surfaces lying in a substantially cylindrical surface, the two setsv being rotatable bodily as a unit on the axis of one of them, the

,other set being mounted rotatably on its own axis eccentric-to that ofthe first set, means for rotating the two sets simultaneously, means for acuating the bars of the second set relative to those of the first set to advance the thread lengthwise of the device, means for selectively putting the actuating means into and out of operation respectively, a frame member disposed adjacent one end ofthe device for supporting it, and a control member for the selective means comprising an arm pivotally connected to the frame at a point offset peripherally from the device and swingable into and out of a position extending alongside the device with the outer end of the arm engaging theouter end of the device to effect reversible interchange of operation of a th device between a thread-advancing condition and a non-advancing condition respectively. I

* RICHARD w. STANLEY.

REFERENCES orrnn The following references are of record in the Number Name a Date 2,289.390 Terrence, et a1. July 14, 1942 2,244,119 Samerdyke June 3, 1941 

